build-snapshot: Don't rebuild existing snapshots

Build snapshot only once if multiple branches point(ed) to the same
commit.

1 files changed, 7 insertions, 4 deletions

diff --git a/bin/build-snapshot b/bin/build-snapshot
index 18777a5..651edd7 100755
--- a/bin/build-snapshot
+++ b/bin/build-snapshot
@@ -42,11 +42,14 @@ create_snapshot()
         version=$(git describe --abbrev=4 'HEAD' | sed 's/release-//')
         tarball="nagios-plugins-$version.tar.gz"
         symlink="nagios-plugins-$branch.tar.gz"
-        make_dist "$version"
-        cp "$tarball" "$snapshot_dir"
-        git reset --quiet --hard
-        git clean --quiet --force -d -x
 
+        if [ ! -e "$snapshot_dir/$tarball" ]
+        then
+                make_dist "$version"
+                cp "$tarball" "$snapshot_dir"
+                git reset --quiet --hard
+                git clean --quiet --force -d -x
+        fi
         cd "$snapshot_dir"
         test -e "$tarball.sha1" || shasum -a 1 -b "$tarball" >"$tarball.sha1"
         ln -s -f "$tarball" "$symlink"